We derive an accurate mass distribution of the galaxy cluster MACSJ1206.2-0847 (z = 0.439) from a combined weak-lensing distortion, magnification, and strong-lensing analysis of wide-field Subaru BVR c I c z′ imaging and our recent 16-band Hubble Space Telescope observations taken as part of the Cluster Lensing And Supernova survey with Hubble program. We find good agreement in the regions of overlap between several weak- and strong-lensing mass reconstructions using a wide variety of modeling methods, ensuring consistency. The Subaru data reveal the presence of a surrounding large-scale structure with the major axis running approximately northwest-southeast (NW-SE), aligned with the cluster and its brightest galaxy shapes, showing elongation with a 2: 1 axis ratio in the plane of the sky. Our full-lensing mass profile exhibits a shallow profile slope dln Σ/dln R -1 at cluster outskirts (R ≳ 1Mpch -1), whereas the mass distribution excluding the NW-SE excess regions steepens farther out, well described by the Navarro-Frenk-White form. Assuming a spherical halo, we obtain a virial mass M vir = (1.1 ± 0.2 ± 0.1) × 10 15 M ⊙ h -1 and a halo concentration c vir = 6.9 ± 1.0 ± 1.2 (c vir 5.7 when the central 50kpch -1 is excluded), which falls in the range 4 ≲ 〈c〉 ≲ 7 of average c(M, z) predictions for relaxed clusters from recent Λ cold dark matter simulations. Our full-lensing results are found to be in agreement with X-ray mass measurements where the data overlap, and when combined with Chandra gas mass measurements, they yield a cumulative gas mass fraction of 13.7+4.5- 3.0% at 0.7Mpch -1( 1.7 r 2500), a typical value observed for high-mass clusters.

Clash: Mass distribution in and around MACS J1206.2-0847 from a full cluster lensing analysis / K. Umetsu, E. Medezinski, M. Nonino, J. Merten, A. Zitrin, A. Molino, C. Grillo, M. Carrasco, M. Donahue, A. Mahdavi, D. Coe, M. Postman, A. Koekemoer, N. Czakon, J. Sayers, T. Mroczkowski, S. Golwala, P.M. Koch, K. Lin, S.M. Molnar, P. Rosati, I. Balestra, A. Mercurio, M. Scodeggio, A. Biviano, T. Anguita, L. Infante, G. Seidel, I. Sendra, S. Jouvel, O. Host, D. Lemze, T. Broadhurst, M. Meneghetti, L. Moustakas, M. Bartelmann, N. Benítez, R. Bouwens, L. Bradley, H. Ford, Y. Jiménez-Teja, D. Kelson, O. Lahav, P. Melchior, J. Moustakas, S. Ogaz, S. Seitz, W. Zheng. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 755:1(2012), pp. 56.1-56.26.

Clash: Mass distribution in and around MACS J1206.2-0847 from a full cluster lensing analysis

C. Grillo;
2012

Abstract

We derive an accurate mass distribution of the galaxy cluster MACSJ1206.2-0847 (z = 0.439) from a combined weak-lensing distortion, magnification, and strong-lensing analysis of wide-field Subaru BVR c I c z′ imaging and our recent 16-band Hubble Space Telescope observations taken as part of the Cluster Lensing And Supernova survey with Hubble program. We find good agreement in the regions of overlap between several weak- and strong-lensing mass reconstructions using a wide variety of modeling methods, ensuring consistency. The Subaru data reveal the presence of a surrounding large-scale structure with the major axis running approximately northwest-southeast (NW-SE), aligned with the cluster and its brightest galaxy shapes, showing elongation with a 2: 1 axis ratio in the plane of the sky. Our full-lensing mass profile exhibits a shallow profile slope dln Σ/dln R -1 at cluster outskirts (R ≳ 1Mpch -1), whereas the mass distribution excluding the NW-SE excess regions steepens farther out, well described by the Navarro-Frenk-White form. Assuming a spherical halo, we obtain a virial mass M vir = (1.1 ± 0.2 ± 0.1) × 10 15 M ⊙ h -1 and a halo concentration c vir = 6.9 ± 1.0 ± 1.2 (c vir 5.7 when the central 50kpch -1 is excluded), which falls in the range 4 ≲ 〈c〉 ≲ 7 of average c(M, z) predictions for relaxed clusters from recent Λ cold dark matter simulations. Our full-lensing results are found to be in agreement with X-ray mass measurements where the data overlap, and when combined with Chandra gas mass measurements, they yield a cumulative gas mass fraction of 13.7+4.5- 3.0% at 0.7Mpch -1( 1.7 r 2500), a typical value observed for high-mass clusters.
cosmology: observations; dark matter; galaxies: clusters: individual (MACS J1206.2-0847); gravitational lensing: strong; gravitational lensing: weak; space and planetary science; astronomy and astrophysics; nuclear and high energy physics
Settore FIS/05 - Astronomia e Astrofisica
2012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/433034
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